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I think I finally figured out how to reliably reproduce this issue!

  1. Add the large noise complication to a watch face. It should always show real time measurement bars when the watch is awake
  2. Restart the watch (to make sure the noise complication is working… when it stops working, the only way to restore function is a restart)
  3. Have someone call you and answer the phone call on the watch
  4. during the call, bring up the keypad and tap some numbers randomly
  5. Hang up the call and put the watch face to sleep
  6. Wake up the watch. The noise complication should show the measurement bars for a second and then it will grey out and say “measurement suspended”
I need to do more testing and I’m not sure if the phone call is necessary but it is absolutely tied to the 0-9 number pad.
The issue still persists. I've had my S9 for maybe 4 months and this crops up constantly. I also use the Sound Levels complication on several of my watch faces, so I know if it is or isn't working. A reboot typically fixes it, but only temporarily, and when it decides to turn the mic off seems arbitrary at best.
 
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I rarely use the Noise complication on my Apple Watch faces because it drains my battery out, but yes when I use the app after I track my handwashing it will need to wait a few seconds before using the Noise app or measure outside Noise.

It works fine on my Apple Watch Series 6 on watchOS 11. I still get notifications from the Noise app as it still measures in the background even after I use Siri or wash my hands, it always goes off when I dry my hands on a hand drying machine. Yes, these things are very loud but a couple of public places have them now.
 
The issue still persists. I've had my S9 for maybe 4 months and this crops up constantly. I also use the Sound Levels complication on several of my watch faces, so I know if it is or isn't working. A reboot typically fixes it, but only temporarily, and when it decides to turn the mic off seems arbitrary at best.
I have found that it’s actually not arbitrary at all in my case. It always and only happens… 100% of the time… after taking a phone call on my watch and using the number pad during the call. Since discovering this I’ve stopped taking calls on my watch (or if I do, I don’t use the number pad) and it 100% never happens. Ever. Going on half a year now. But the second I use the number pad during a call… the noise complication dies.

I’ve reported this bug to Apple along with the steps to replicate. I would encourage others to do the same. They won’t ever fix it unless there are multiple complaints / bug reports. My latest bug report was done through the public beta program and I’m hoping that reporting the bug as part of the beta testing might have more luck… but I’m not holding my breath.
 
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This bug has not been fixed in just released public versions of iOS 18 and Watch OS 11. All of my bug reports apparently just go into a black hole.
 
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